122198591 has 2 divisors, whose sum is σ = 122198592. Its totient is φ = 122198590.

The previous prime is 122198581. The next prime is 122198599. The reversal of 122198591 is 195891221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-122198591 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122198599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61099295 + 61099296.

It is an arithmetic number, because the mean of its divisors is an integer number (61099296).

Almost surely, 2^122198591 is an apocalyptic number.

122198591 is a deficient number, since it is larger than the sum of its proper divisors (1).

122198591 is an equidigital number, since it uses as much as digits as its factorization.

122198591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 38.

The square root of 122198591 is about 11054.3471539481. The cubic root of 122198591 is about 496.2365316853.

The spelling of 122198591 in words is "one hundred twenty-two million, one hundred ninety-eight thousand, five hundred ninety-one".